package code.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;
import java.nio.charset.Charset;

/**
 * 1.SimpleChannelInboundHandler 是 ChannelInboundHandlerAdapter 子类
 * 2.HttpObject 客户端和服务器端相互通讯的数据被封装成 HttpObject
 * @TODO 打印语句输出
 * @author rocky
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    // channelRead0 读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        // 判断msg 是不是 http request请求
        if (msg instanceof HttpRequest) {

            System.out.println("pipeline hashcode " + ctx.pipeline().hashCode() + " testserverHandler hash = " + this.hashCode());

            System.out.println(" mgs 类型 = " + msg.getClass());
            System.out.println("客户端地址" + ctx.channel().remoteAddress());

            // 获取到
            HttpRequest httpRequest = (HttpRequest) msg;
            // 获取URI
            URI uri = new URI(httpRequest.uri());
            if ("/favicon.ico".equals(uri.getPath())) {
                System.out.println("请求了 favicon.ico,不做响应");
                return;
            }

            // 回复信息给浏览器[Http协议]
            ByteBuf content = Unpooled.copiedBuffer("hello ,我是服务器", CharsetUtil.UTF_8);

            // 构造一个http的响应 即 httpresponse
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain;charset=utf-8");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());

            // 将构建好 response 返回
            ctx.writeAndFlush(response);
        }
    }
}
